*{margin: 0;padding: 0;}
li{list-style: none;}
body{
    background-color: rgb(241, 242, 246);
}

.fl{
    float: left;
}
.fr{
    float: right;
}
.clear:after{
    content: "";
    height: 0;
    display: block;
    clear: both;
}
.mt{
    margin-top: 20px;
}
.mb{
    margin-bottom: 20px;
}
.ml{
    margin-left: 20px;
}
.mr{
    margin-right: 20px;
}
::-webkit-scrollbar{
    display: none;
}
